Duplicating machine



1935- J. w. HYERNLUND ET AL 2,019,702

DUPLICATING MACHINE Filed Oct. 18, 1935 3 Sheets-Sheet l 14 .5 ii- :31; J6.

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DUPLICATING MACHINE Filed Oct. 18, 1933 3 Sheets-Sheet 2 Nova 5, 1935.

J. W. HERNLUND ET AL DUPLICATING MACHINE Filed Oct. 18, 1933 3 Sheets-Sheet 3 Patented Nov. 5, 1935 UNITED STATES PATENT OFFIE DUPLICATING MACHINE Virginia Application October 18, 1933, Serial No. 694,178

2 Claims.

This invention relates to improvements in duplicating machines and, more particularly, to such machines of the hectograph type. The invention may be embodied, for example, in a machine of the type disclosed in the co-pending .application of Marchev and Hernlund, Serial No. 663,404, filed March 29, 1933.

Among the features of our invention is improved mechanism for supporting and handling the gelatin band. This band is ordinarily carried on two spindles forming a supply and receiving spindle. The portion of the band between the spindles lies over the platen. As portions of the band are used, the same is advanced over the platen by winding the same from the supply spindie to the receiving spindle. Our invention contemplates improved means for operating and controlling these spindles.

Other features and advantages of our invention will appear more fully as we proceed with our specification.

In that form of device embodying the features of our invention shown in the accompanying drawings- Fig. 1 is a plan View of a duplicating machine embodying the invention.

Fig. 2 is a section taken on line 22 of Fig. 1.

Fig. 3 is a side elevation of the spindle winding and controlling mechanism.

Fig. 4 is a view similar to Fig. 3 showing parts removed and parts in section to illustrate the apparatus more fully.

Fig. 5 is a section taken on line 5-5 of Fig. 4.

Fig. 6 is a section taken on line 66 of Fig. 5,

. and

Fig. 7 is a section taken as indicated by the line 'I'I on Fig. 1.

Various details of the duplicating mechanism are well known in the art or .are shown in the I above-mentioned co-pending application of Marchev and I-Iernlund, Serial No. 663,404, filed March 29, 1933. Consequently, all of such details will not be described; but only the construction and operation necessary to disclose the invention claimed herein.

As shown in the drawings, I 0 indicates, in gen,- eral, a cabinet provided with a suitable top I2 on which is mounted the duplicating mechanism. This latter includes the usual platen I2a on which is supported the gelatin band I3, the ends of which are wound on supply and receiving spindles I4 and I5, respectively. When the portion of the band over the platen is to be replaced, the same is wound onto the receiving spindle, causing a fresh portion to lie over the platen.

I6 indicates, in general, a carriage carrying the usual platen roller I1 and pressure roller I8 cooperating therewith to feed sheets of paper to the duplicating surface on the band I3. v

The ends of the spindles I5 and I5 are provided with caps, the outer faces of which are concaved and slotted. This construction is shown in Fig. 5 the cap on the spindle I5 being indicated by I9 and the slot therein, by. 26. The two ends of the receiving spindle are rotatably supported in suitable bearing members 2I and 22, shown respectively in Figs. 5 and '7. The two ends of the supply spindle I4 are likewise supported in suitable bearing members 23 and 24, shown in Fig. 1. The bearings for the spindles on one side of the machine have cooperating spring-pressed pins 25 adapted to snap into the concavities in the ends of the caps I9 on the spindles. This construction is shown in Fig. 7, wherein the spring-pressed pin 25 is supported in a suitable housing 26, 21 indicating the spring which yieldingly forces the concave end of the pin into the concavity in the cap I9 on the end of the spindle I5.

The opposite ends of the spindles I4 and I5 cooperate with the winding, clutch and locking mechanism to be more particularly described hereinafter. This mechanism is best shown in Figs. 3, 4, 5 and 6. As here shown, there is provided for each spindle a locking mechanism in the form of an overrunning clutch with means for releasing or rendering said clutch inoperative. Since the clutch construction is the same in each case, we have shown and described but one in detail. For example, as shown in Fig. 5, there is arranged opposite the bearing 2i which carries the end of the spindle I5 a spring-pressed pin 28 provided with a flattened end 28' adapted to engage in the slot 20 in the end of the spindle. This pin 28 is yieldingly pressed inwardly by the spring 29 and the end of the same is provided with a knob 30 by which the pin may be pulled outwardly to withdraw the blade 28 from the slot 20 to release the end of the spindle.

Keyed onto the pin or shaft 28 is a gear 3I meshing with the spiral gear 32 on the shaft 35, the latter being supported in suitable bearings 34 and 35. A handle 36 is provided to impart rotation to the shaft 33.

Inside of the gear 3I is provided a triangular member 31 provided with three pockets or recesses 38 in which are located the rollers 33 yieldingly pressed by the springs 46 to cause them to tend to wedge between the inner surface of the gear 3| and the flat faces 31' of the member 31. That is, as viewed in Fig. 4, the gear 3| is perrection but is prevented from rotating in a reverse direction because of a wedging of the rollers 39. This construction constitutes, therefore, an overrunning clutch permitting forward rotation of the receiving spindle and preventing reverse rotation thereof.

The triangular member 3! is held against rotation within a hollow sheet metal member Illa forming part of the frame of the duplicating machine. It will be noted that the triangular member 31 is provided with pins 31a, the purpose of which will presently be described.

Means are provided, however, for rendering the overrunning clutch just described inoperative. Such means includes a rotatable member 4| carrying three pins 42, 42, adapted to engage the rollers 39 and force them up against the springs 40 when said member 4| is rotating in a clockwise direction. When the rollersare thus pressed up against the springs, they are not permitted to wedge and, consequently, the overrunning clutch is rendered inoperative. When in this position, the gear 3| can be rotated in either direction. To move the member 4|, the same is provided with an ear or lug 43 adapted to be engaged by the eccentric 44. As shown in Fig. 4, the overrunning clutch for the spindle I5 is operative. Angular displacement of the rotatable member 4| is limited by the pins 31a which pass through notches 4 la in the rotatable member 4|. There is a similar overrunning clutch provided in connection with the supply spindle I4. This need not be described in detail. It will suffice to say that the same is illustrated in Fig. 4, the gear being indicated by I3I, the triangular member by I37 and the wedging rollers and springs by I39 and I40, respectively. The member I3'I is held against rotation within the frame member IIla. Releasing mechanism is also provided for this clutch in the form of a rotatable member I4I provided with the pins I42 adapted to engage the rollers I39. As shown in Fig. 4, when'the pins are in the positions illustrated by the solid lines, the clutch is operative. When the member MI is rotated in a counter-clockwise direction to cause the pins I42 to be moved into the locations shown by the dotted lines in engagement with the rollers I39, the clutch is rendered inoperative. In order to accomplish this movement, the member MI is provided with a lug or ear I43 adapted to be engaged by a collar 50 on the shaft 5| which lies in alinement with the shaft 33. 52 indicates a spring on this shaft with one end pressing against the bearing 54 and the other end against the collar 50 to yieldingly hold the collar in the position shown by the solid lines in Fig. 4 out of engagement with the lug I43. When the shaft is moved to the right, however, the collar is moved to the position indicated by the broken lines in Fig. 4 in engagement with the lug I43 to rotate the member I4I to cause the pins I42 to engage the rollers I39 to render the clutch inoperative and permit rotation of the spindle I4 in either direction.

For the purpose of moving the shaft 5| to move the collar 50, as above described, there is pivotally attached to one end thereof one end of a link 55, the other end of the latter being pivotally attached to the wheel 56. Rotation of the wheel as shown in Fig. 4, serves to move the shaft 5| and the collar 50 to render the overrunning clutch for the spindle I4 operative or inoperative.

In the operation of the device, assuming that the exposed portion of the gelatin band on the mitted to rotate forwardly or in a clockwise diplaten has become used up and needs to be replaced, the wheel 56 is rotated to release the overrunning clutch for the supply spindle I4. The receiving spindle I5 is then rotated forwardly by means of the crank 36 to bring a new portion of 5 the band over the platen. The collar 50 is then moved to the left to lock the supply spindle I4 against further rotation in the forward direction. The crank 36 is then operated sufficiently to cause slight forward rotation of the receiving spindle to 10 stretch the band suiiiciently over the platen. The tautness thus given to the band remains, since reverse rotation of the receiving spindle is prevented by the overrunning clutch.

With the construction shown, the machine 15 can be converted into the machine disclosed in the above-mentioned co-pending application of Marchev and Hernlund, Serial No. 663,404, filed March 29, 1933, as far as the winding and rewinding of the gelatin band are concerned. It 20 is for this reason that means are provided for releasing the clutch conctrolling the receiving spindle I5.

While we have shown and described certain I embodiments of our invention, it is to be un- 25 derstood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of our invention as disclosed in the appended claims, in which it is our in 30 tention to claim all novelty inherent in our in vention as broadly as permissible, in view of the prior art.

What we regard as new, and desire to secure by Letters Patent, is: 35

1. In a machine of the character described; a platen; a gelatin band lying over the platen with one end wound on a supply spindle and the other end wound on a receiving spindle; means for rotating the receiving spindle forwardly to wind 40 the band thereon, said means including a gear connected to the spindle, a shaft tangentially arranged with respect to said gear, and a spiral gear on said shaft meshing with thefirst mentioned gear; means holding said shaft and said ,5 spiral gear against any longitudinal displacement; an overrunning clutch to prevent reverse rotation of the receiving spindle; means for looking the supply spindle against forward rotation; and means for releasing said locking means,'said 50 releasing means including a shaft in alinement with said first-mentioned shaft.

2. In a machine of the character described; a platen; a gelatin band lying over the platen with 7 one end wound on a supply spindle and the other 55 end wound on a receiving spindle; means for r0- tating the receiving spindle forwardly to wind the band thereon, said means including a gear connected to the spindle, a rotatable shaft arranged tangentially to said gear, and a spiral (50 gear on said shaft meshing with said first-men tioned gear; means holding said shaft and said spiral gear against any longitudinal displacement, an overrunning clutch to prevent reverse rotation of the receiving spindle; means'for ren- 65 dering said overrunning clutch inoperative; an overrunning clutch normally preventing forward rotation of the supply spindle and permitting reverse rotation thereof; and means for rendering said overrunning clutch inoperative, said 70 means including an axially movable shaft in alinement with said first-mentioned shaft.

JOHN W. HERNLUND.

HUBERT JAGGER. 5' 

